/*******************************************************************************
 * Copyright (c) 2004, 2015 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jface.viewers.deferred;

/**
 * Interface for objects that can listen to changes in an IConcurrentModel.
 * Elements in an IConcurrentModel are unordered.
 *
 * @since 3.1
 */
public interface IConcurrentModelListener {

	/**
	 * Called when elements are added to the model
	 *
	 * @param added elements added to the model
	 */
	public void add(Object[] added);

	/**
	 * Called when elements are removed from the model
	 *
	 * @param removed elements removed from the model
	 */
	public void remove(Object[] removed);

	/**
	 * Called when elements in the model have changed
	 *
	 * @param changed elements that have changed
	 */
	public void update(Object[] changed);

	/**
	 * Notifies the receiver about the complete set
	 * of elements in the model. Most models will
	 * not call this method unless the listener explicitly
	 * requests it by calling
	 * <code>IConcurrentModel.requestUpdate</code>
	 *
	 * @param newContents contents of the model
	 */
	public void setContents(Object[] newContents);
}
